College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China; State Key Laboratory of Bio-polysaccharide Fiber Forming and Eco-Textile, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 3):126967. doi: 10.1016/j.ijbiomac.2023.126967. Epub 2023 Sep 16.
In this paper, a kind of magnetic ferric oxide/polyvinyl alcohol/calcium alginate/UiO-67 (FeO/PVA/CA/UiO-67) nanospheres with homogeneous surface interconnecting structures was prepared by using macromolecular polymer polyvinyl alcohol and sodium alginate as carriers and zirconium organic skeleton as nanocrystals. The properties of magnetic nanospheres were studied by SEM, FT-IR, TGA, XRD, BET, VSM and Zeta potential. The impression of diverse temperatures, MB concentrations, interaction time, pH, and magnetic aerogel sphere dose on MB removal was studied. The optimum adsorption temperature and pH of magnetic nanospheres for MB were 298 K, and 10, respectively. Langmuir simulated that the maximum removal of MB by magnetic nanospheres at room temperature (298 K) was 1371.8 mg/g. The removal of MB by magnetic nanospheres complied with the pseudo-first-order kinetic model. The isotherm simulation can infer that the Langmuir model was more comply with MB adsorption on magnetic aerogel spheres. Thermodynamic studies have confirmed that the removal of MB by magnetic nanospheres was exothermic and spontaneous. The interaction mechanism of MB on magnetic nanospheres can be deduced by FT-IR and BET, including hydrogen bond, π-π bond, electrostatic interaction, and mesoporous pore flow. The removal rate of nanospheres for MB still reached 70.06 % after six cycles.
本文采用高分子聚合物聚乙烯醇和海藻酸钠作为载体，以锆有机骨架为纳米晶，制备了具有均匀表面互联结构的磁性氧化铁/聚乙烯醇/海藻酸钠/UiO-67（FeO/PVA/CA/UiO-67）纳米球。通过 SEM、FT-IR、TGA、XRD、BET、VSM 和 Zeta 电位研究了磁性纳米球的性能。研究了不同温度、MB 浓度、相互作用时间、pH 值和磁性气凝胶球剂量对 MB 去除的影响。磁性纳米球对 MB 的最佳吸附温度和 pH 值分别为 298 K 和 10。Langmuir 模拟表明，磁性纳米球在室温（298 K）下对 MB 的最大去除率为 1371.8 mg/g。磁性纳米球对 MB 的去除符合拟一级动力学模型。等温线模拟可以推断，Langmuir 模型更符合 MB 在磁性气凝胶球上的吸附。热力学研究证实，磁性纳米球对 MB 的去除是放热和自发的。通过 FT-IR 和 BET 可以推断出 MB 在磁性纳米球上的相互作用机制，包括氢键、π-π 键、静电相互作用和中孔孔流。纳米球对 MB 的去除率在经过六次循环后仍达到 70.06%。
